Oil scraper



R. MILLER July 8, 1930.

OIL SCRAPER Filed June 5, 1929 INVENTOR- Rqjoh Milieu BY AVJQ J K 7/ /75 A TT'ORNEY Patented July 8, 1930 PATENT OFFICE OIL SCRAPER Application filed June 5,

This invention relates to engines, but more particularly to an oil scraper ada ted to be carried b a piston to act against t e wall of thecylin er.

It is an object of the invention to prevent the passage of an excessive amount of oil along the cooperating surfaces of the iston and the cylinder into the upper portion of the cylinder, as for instance, the combustion 1p chamber of an internal combustion engine.

pin

Other objects will be in art obvious and in part pointed out hereina ter. 7

In the drawings illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a sectional elevation of so much of an engine as will serve to illustrate the invention, and

Figures 2 and 3 are transverse views taken through Figure 1 on the lines 2-.2 and 33 looking in the direction indicated by the arrows.

Referring more particularly to the drawings, A re resents a cylinder having a piston chamber E in which is disposed a reciprocatory piston C. The piston C is provided with the usual connecting rod D connected opelfitively to the piston by means of a wrist In accordance with the 'ractice of the invention, means are provi ed for removing from the wall of the cylinder B any excessive amount of lubricant which may find its way between the cooperative surfaces of the cy inder B and the piston C. To this end the piston C is provided with an annular ring groove F of which the end walls G and H are preferably arallel to each other.

Within tlib groove F is disposed a scriper ring J having at one end an inclined sur ace K and with its opposite end seats against the wall G of the oove. Prefera'bl the riphery of the ring J is of conical orm, t at is, the eri hery has a back taper to form a knife e go at the juncture of the periphery of the ring and the inclined surface K. The arrangement is such that during the reciprocation of the piston the knife ed e L wi l, by bearing a ainst the wall of thecy inder B, scrape there rom any excess oil which may 1929. Serial No. 868,590.

have been deposited thereon. Such oil will then flow into a shallow oil groove 0 which is located below and is in-communication with the ring groove F and also with the interior of the piston C through a passage, or as illus trated in the drawings, through a plurality of passages P in the c linder.

can are provided for constantly holding the end of the ring J in fluid tight relationship with the Wall G of the oove. In furtherance of this end a plurality of segmental members Q are disposed in the ring groove to seat with one end against the wall H of said groove. The members Q are provided with inclined surfaces R of the same degree of inclination as the inclined surface K of the ring against which they bear.

Disposed in the innermost end of the groove F and therefore rearwardly of the segmental members Q is a s ring ring S, preferably of the corrugate type, which acts against the bottom of the roove F and also against the segmental mem ers to constantly urge the said members Q radially outward. he pressure thus exerted by the spring S tends to expand the ring J so that the knife edge L will be held in close contact with the wall of the cylinder B, and at the same time, by forcing the members Q underneath the ring J, the said ring will be pressed firmly against the wall G of the groove to prevent the flow of oil alon these surfaces and into the upper portion 0 the cylinder.

- I claim:

1. In an oil scraper, the combinationof a cylinder and a piston in the cylinder, a rin roove in the iston, a ring in the groove an aving an inc med surface at one end, an edge on the ringto scrape oil from the cylinder, segments in the groove haying inclined surfaces bearingagainst the inclined surface of the ring, a spring rin in the ring oove to press the segments ra "ally outwar thereby tending to expand the ring for maintainin the edge in contact with the cylinder and pressing the ring into fluid tight relationship with the wall of the roove, and a passage in the piston located be ow the ring groove and communicatin therewith to remove the oil scraped from t e cylinder by the said ring.

2. In an oil scraper, the combination of a cylinder and apiston in the cylinder, 3, ring groove in the piston, a ring in the ring groove and havin segments lsposed loosel in the ring groove and having inclined sur aces to bear against the inclined surface of the ring, an edge on the ring to scrape oil from the cylinder, an oil groove in the piston located below the rin groove and communicating therewith, said piston having a passage-for conve ing oil from the oil groove to the interioro the piston, and a spring ring in the groove to press the segments radially outward for expanding the rin and for pressing the end of the ring into fluid tight relationship with the wall of the cylinder.

In testimony whereof I have signed this specification.

RALPH MILLER.

an inclined surface at one end, i 

